1256920 has 48 divisors (see below), whose sum is σ = 3281040. Its totient is φ = 424512.

The previous prime is 1256917. The next prime is 1256923. The reversal of 1256920 is 296521.

It is an interprime number because it is at equal distance from previous prime (1256917) and next prime (1256923).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18727 + ... + 18793.

It is an arithmetic number, because the mean of its divisors is an integer number (68355).

2^1256920 is an apocalyptic number.

1256920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1640520).

1256920 is an abundant number, since it is smaller than the sum of its proper divisors (2024120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1256920 is an equidigital number, since it uses as much as digits as its factorization.

1256920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1256920 is about 1121.1244355557. The cubic root of 1256920 is about 107.9201513130.

The spelling of 1256920 in words is "one million, two hundred fifty-six thousand, nine hundred twenty".